circuitpython/ports/nrf/boards/sparkfun_nrf52840_micromod

SparkFun MicroMod nRF52840 Processor

Featuring the nRF52840 SoC from Nordic Semiconductor, the SparkFun MicroMod nRF52840 Processor offers a powerful combination of ARM Cortex-M4 CPU and 2.4 GHz Bluetooth transceiver in the MicroMod form-factor with the M.2 MicroMod connector to allow you to plug in a compatible MicroMod Carrier Board with any number of peripherals.

The MicroMod nRF52840 Processor features the same Raytac MDBT50Q-P1M found on our Pro nRF52840 Mini. This module includes an integrated trace antenna, fits the IC to an FCC-approved footprint along with including decoupling and timing mechanisms that would need to be designed into a circuit using the bare nRF52840 IC. The Bluetooth transceiver included on the nRF52840 boasts a BT 5.1 stack and supports Bluetooth 5, Bluetooth mesh, IEEE 802.15.4 (Zigbee & Thread) and 2.4Ghz RF wireless protocols (including Nordic's proprietary RF protocol) allowing you to pick which option works best for your application.

We've also routed two I²C buses, 2 SPI buses, eleven GPIO, dedicated digital, analog, PWM & PDM pins along with multiple serial UARTS to cover nearly all of your peripheral needs.

CircuitPython Pin Defs

CircuitPython pin definitions, while simialr to other boards represent a slight departure from just the typical A and D pin definitions. The majority of general pins are labled as G (or alternatively, BUS,) as the MicroMod system they build on uses those names to specify pins that may not be specficially analog or digital.

This can be somewhat confusing, especially around the analog pins. Here's a quick pin-map. This pin map will use the label either on the SparkFun MicroMod ATP Carrier Board, or the pin name on the graphical datasheet. Some of the aditional aliases are just names to make naming consistent (e.g.: RTS/CTS), but they also can refer to additional functionality a pin may have (e.g.: NFC pins)

MicroMod Pin #	ATP Pin Label	Pin Definition	Additional Definitons	Pin/Port Reference	Notes
8	G11			(Not Connected)
10	D0	D0		P0_27
11	BOOT	BOOT	BUTTON1	P0_07
12	SDA	SDA		P0_08
13	RTS1	RTS	RTS1	P1_02
14	SCL	SCL		P0_11
15	CTS1	CTS	CTS1	P1_09
16	/I2C INT	I2C_INT	P0_15
17	TX	TX	TX1	P1_03
18	D1	D1	CAM_TRIG	P1_08
19	RX	RX	RX1	P1_10
20	RX2	RX2		P1_05
22	TX2	TX2		P1_07
32	PWM0	PWM0	P0_06
34	A0	A0	ADC0	P0_04	Attached to AIN2
38	A1	A1	ADC1	P0_05	Attached to AIN3
40	G0	G0	BUS0	P0_29	Attached to AIN5
42	G1	G1	BUS1	P0_03	Attached to AIN1
44	G2	G2	BUS2	P1_13
46	G3	G3	BUS3	P1_12
47	PWM1	PWM1	P0_16
48	G4	G4	BUS4	P1_11
49	BATT_VIN	BATT_VIN3		P0_30	Attached to AIN6, will be battery voltage / 3.
50	PDM_CLK	PDM_CLK		P0_25
51	SDA1	SDA1		P1_01
52	PDM_DATA	PDM_DATA		P0_26
53	SCL1	SCL1		P0_24
55	/CS	CS		P0_20
57	SCK	SCK		P0_28	Attached to AIN4
59	COPI	COPI	MOSI	P0_31	Attached to AIN7
61	CIPO	CIPO	MISO	P0_02
63	G10	G10	NFC2, ADC_DP, CAM_VSYNC	P0_10	Attached to NFC2
65	G9	G9	NFC1, ADC_DM, CAM_HSYNC	P0_09	Attached to NFC1
67	G8	G8		P1_14
69	G7	G7	BUS7	P1_04
71	G6	G6	BUS6	P1_06
73	G5	G5	BUS5	P0_15

Peripheral Naming

CircuitPython attempts to stay in line with the naming of the serial peripheral naming in the MicroMod system. The bare UART pins are also named 1. The UART 2 pins are named 2. However, the I2C names on MicroMod are and 1. Perhaps this will change in the future, but as of Interface v1, it may lead to some confusion.

Bootloader Notes

The MicroMod nRF52840 Processor needs to have the Adafruit nRF52 UF2 bootloader flashed on it. TODO: LINK TO BUILD

Hardware Reference

The MicroMod nRF52840 Processor hardware layout is open source:

• Schematic
• Eagle Files
• Hookup Guide